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Description of Business, Basis of Presentation and Significant Accounting Policies - Additional Information (Detail) |  | 1 Months Ended | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | --- | ---
Feb. 01, 2012 USD ($) | Dec. 31, 2005 USD ($) | May 31, 2018 USD ($) CompensationPlan shares | May 31, 2017 USD ($) | May 31, 2018 USD ($) CompensationPlan Deliverables Segments | May 31, 2017 USD ($) | Nov. 30, 2017 USD ($)
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Number of deliverables for revenue recognized | Deliverables |  |  |  |  | 2 |  |
Period of doubtful for accounts receivable due from client |  |  |  |  | 21 years |  |
Contracted storage periods option two |  |  |  |  | 21 years |  |
Contracted storage periods option one |  |  |  |  | 1 year |  |
Contracted storage periods option three |  |  |  |  | Lifetime |  |
Deferred revenue recognition period |  |  |  |  | 12 months |  |
Valuation allowance |  |  | $ 1,605,000 |  | $ 1,605,000 |  | $ 2,316,000
U.S. Income tax expense (benefit) |  |  | 294,000 | $ 296,000 | 3,497,000 | $ 602,000 |
Income tax expense related to the reduction of the federal tax |  |  |  |  | $ 2,985,000 |  |
Federal tax rate |  |  |  |  | 21.00% |  |
Foreign income tax expense |  |  | 22,000 | 36,000 | $ 22,000 | 36,000 |
Minimum percentage probability of realized tax benefit on settlement |  |  |  |  | 50.00% |  |
Provisions for interest or penalties related to uncertain tax positions |  |  | 0 | 0 | $ 0 | 0 |
Uncertain tax provisions |  |  | 0 | 0 | 0 | 0 |
Impairment on long lived assets |  |  | $ 0 | 0 | $ 0 | 0 |
Number of employee stock based compensation plan | CompensationPlan |  |  | 2 |  | 2 |  |
Stock-based option compensation expense |  |  | $ 156,000 | 394,000 | $ 268,000 | 471,000 |
Stock compensation expense reversed |  |  | $ 444,000 |  |  |  |
Stock compensation, number of shares opted to lump sum cash payment | shares |  |  | 30,000 |  |  |  |
Unrealized holding gain and loss, trading securities |  |  | $ 9,016 | (38,590) | (25,208) | (65,210) |
Unrealized gain on marketable securities, net of tax |  |  | 1,254 | $ 33,701 | 120,000 | $ 26,640 |
Payment warranty |  | $ 50,000 |  |  |  |  |
Increased payment warranty | $ 75,000 |  |  |  |  |  |
Additional payment warranty | $ 10,000 |  |  |  |  |  |
Reserves recorded under programs |  |  | $ 18,000 |  | $ 18,000 |  | $ 18,000
Accounts Receivable [Member] |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Period of doubtful for accounts receivable due from client |  |  |  |  | 30 days |  |
Umbilical Cord Blood and Cord Tissue Stem Cell Service and PrepaCyte-CB [Member] |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Number of reportable segments | Segments |  |  |  |  | 2 |  |

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